Kinetic Analysis of Spherical Wustite Reduction Transported with CH4 Gas

Takeuchi, Naoyuki; Nomura, Yohei; Ohno, Ko Ichiro; Maeda, Takayuki; Nishioka, Koki; Shimizu, Masakata

doi:10.2355/tetsutohagane.94.115

Cited by 10 publications

(11 citation statements)

References 6 publications

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“…The reaction generates reductants, such as FeO, CO 2 , and H 2 O, at the gas-liquid phase interface, and FeO diffuses into the slag body. The gas products diffuse into the body of the gas phase, which may continue to react with coke to generate CO and H 2 17 – 19 .…”

Section: Discussionmentioning

confidence: 99%

Smelting reduction and kinetics analysis of magnetic iron in copper slag using waste cooking oil

Wang

et al. 2017

Sci Rep

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To improve the recovery of copper, the viscosity of copper molten slag is decreased by the reduction of magnetic iron, which, in turn, accelerates the settling and separation of copper droplets from the slag. A new technology is proposed in which waste cooking oil is used as a reductant to reduce magnetic iron in the copper smelting slag and consequently reduce carbon emissions in the copper smelting process. A kinetic model of the reduction of magnetic iron in copper slag by waste cooking oil was built using experimental data, and the accuracy of the model was verified. The results indicated that the magnetic iron content in the copper slag decreased with increasing reduction time and an increase in temperature more efficiently reduced magnetic iron in the copper slag. The magnetic iron in the copper slag gradually transformed to fayalite, and the viscosity of the copper molten slag decreased as the magnetic iron content decreased during the reduction process. The reduction of magnetic iron in the copper molten slag using waste cooking oil was a first-order reaction, and the rate-limiting step was the mass transfer of Fe3O4 through the liquid boundary layer.

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Section: Discussionmentioning

confidence: 99%

Smelting reduction and kinetics analysis of magnetic iron in copper slag using waste cooking oil

Wang

et al. 2017

Sci Rep

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“…While there are many studies on the reduction from wüstite to iron [31][32][33][34][35][36][37][38] and reduction of iron oxides from 673 to 1473 K, this work focusses on the suspension reduction process of haematite and magnetite above 1473 K for emerging alternative ironmaking processes. A reaction kinetics study is a basis for a study of the whole reaction process.…”

Section: Iron Oxides Suspension Reduction Kineticsmentioning

confidence: 99%

Review and data evaluation for high-temperature reduction of iron oxide particles in suspension

Chen

Zeilstra

Stel

et al. 2019

Ironmaking & Steelmaking

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High-temperature reduction processes of iron oxide particles suspension are promising in carbon emission abatement. Recently, researchers have contributed abundant knowledge of the reaction mechanism and kinetics of iron oxide particles above 1473 K, while there was very limited information 10 years ago. Although the understanding of the high-temperature reduction of iron oxide particles is still not comprehensive, a brief review of the academic reports is helpful for the future work on this topic. The high-temperature reduction of iron oxide suspension is characterized by having: rapid reaction, obvious thermal decomposition and melting process. Evaluation of the kinetic data shows that the reduction process of single particles is not rate-determined by the diffusion process at the studied temperatures. The reaction rate constant is within 10 −2 -10 s −1 in these studies. Furthermore, comparing previous studies in iron oxide reduction field, the phase transformation and effect of gangue minerals to the reduction of iron oxide particles above 1473 K requires more input and research. ARTICLE HISTORY

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“…Methane has been reported as an effective reducing agent by Ghosh et al [7] for iron oxide, Khoshandam et al for chromium oxide [8], manganese oxide [9] and cobalt oxide [10], by Anacleto and Ostrovski for chromium oxide [11], Ale-Ebrahim and Jamshidi [12] for zinc oxide, Alizadeh et al [13] for nickel oxide, Takeuchi et al [14] for wustite and Ostrovski and Zhang for iron ore and manganese, chromium and titanium oxides [15].…”

Section: Introductionmentioning

confidence: 97%